L., P., R., B., L., W.(1985).Construction planning, equipment and methods / Robert L. Peurifoy, William B. Ledbetter (Ed.ke-4).:McGraw-Hill.
Gaya MLA
Peurifoy, Robert, L.., Ledbetter, William, B.."Construction planning, equipment and methods / Robert L. Peurifoy, William B. Ledbetter".Ed.ke-4:McGraw-Hill,1985.Textbook.